Radioprotection to the eye during CT scanning

Area of Science:

• Radiological Physics
• Ophthalmology
• Medical Imaging

Background:

• The eye lens is highly sensitive to radiation, posing a risk to children and patients undergoing repeated cranial CT scans.
• Cranial CT involves radiation exposure, necessitating protective measures for sensitive organs like the lens.

Purpose of the Study:

• To evaluate the efficacy of bismuth shielding in reducing radiation dose to the eye during cranial CT.
• To assess the safety and effectiveness of varying thicknesses of bismuth shielding.

Main Methods:

• Phantom and human studies were conducted using bismuth-coated latex shields of varying thicknesses (1T, 2T, 3T).
• Radiation dose to the eye was measured using thermoluminescent dosimeters.
• Image artifact assessment was performed to evaluate shield compatibility.

Main Results:

• Bismuth shielding reduced radiation dose by 48.5% to 65.4% in phantom studies and 39.6% to 52.8% in patient studies.
• Shielding was highly statistically significant in reducing radiation dose for all thicknesses.
• No significant image artifact was observed with bismuth shielding.

Conclusions:

• Bismuth-coated latex shielding is an effective, simple, and inexpensive method to reduce eye lens radiation during cranial CT.
• This protective measure can significantly lower radiation-induced risks for patients undergoing CT scans of the head.